feat: add action-validator and clean up CI workflows (#513)

* chore(pre-commit): update hooks and add action-validator

Update uv-pre-commit 0.10.9→0.10.11 and checkov 3.2.508→3.2.510.
Normalize single quotes to double quotes in hook args.
Add action-validator v0.8.0 hook for GitHub Actions validation.

* fix(ci): clean up workflow path filters

Remove non-existent action.yaml paths from action-security workflow.
Fix glob patterns (**.md → **/*.md) in pr-lint workflow.
Remove unused trigger paths (yarn.lock, pnpm-lock.yaml,
requirements.txt, .github/labels.yml, docs/**) from security-suite
and sync-labels workflows.

* feat(make): add lint-actions target for action-validator

Add lint-actions target that runs action-validator via pre-commit.
Include it in the lint dependency list and .PHONY declaration.

* docs: add context-mode routing rules to CLAUDE.md

Add mandatory routing rules section for context-mode MCP plugin,
documenting blocked commands, redirected tools, tool selection
hierarchy, and output constraints.

* fix(lint): resolve action-validator failure on language-version-detect

- Remove unsupported `deprecated: true` from language-version-detect/action.yml
  (deprecation already communicated via description field)
- Scope action-validator pre-commit hook to workflow and action.yml files only
- Make missing pre-commit a hard error in lint-actions target

* fix(deps): update action pins and fix trivy-action version comment

Update SHA-pinned action references to latest versions:
- github/codeql-action v4.32.6 → v4.33.0
- nick-fields/retry v3.0.2 → v4.0.0
- actions/cache v5.0.3 → v5.0.4
- oven-sh/setup-bun v2.1.3 → v2.2.0
- softprops/action-gh-release v2.5.0 → v2.6.1
- github/issue-metrics v4.1.0 → v4.1.1
- shivammathur/setup-php 2.36.0 → 2.37.0
- astral-sh/setup-uv v7.5.0 → v7.6.0
- terraform-linters/setup-tflint v6.2.1 → v6.2.2
- aquasecurity/trivy-action: pin from master to v0.35.0

Fix pinact warning in docker-build by adding missing v prefix
to trivy-action version comment (0.35.0 → v0.35.0).

php-tests/action.yml

@@ -319,7 +319,7 @@ runs:
 
     - name: Setup PHP
       id: setup-php
-      uses: shivammathur/setup-php@44454db4f0199b8b9685a5d763dc37cbf79108e1 # 2.36.0
+      uses: shivammathur/setup-php@accd6127cb78bee3e8082180cb391013d204ef9f # 2.37.0
       with:
         php-version: ${{ steps.detect-php-version.outputs.detected-version }}
         extensions: ${{ inputs.extensions }}
@@ -356,7 +356,7 @@ runs:
 
     - name: Cache Composer packages
       id: composer-cache
-      uses: actions/cache@cdf6c1fa76f9f475f3d7449005a359c84ca0f306 # v5.0.3
+      uses: actions/cache@668228422ae6a00e4ad889ee87cd7109ec5666a7 # v5.0.4
       with:
         path: |
           vendor
@@ -376,7 +376,7 @@ runs:
         composer clear-cache
 
     - name: Install Composer Dependencies
-      uses: nick-fields/retry@ce71cc2ab81d554ebbe88c79ab5975992d79ba08 # v3.0.2
+      uses: nick-fields/retry@ad984534de44a9489a53aefd81eb77f87c70dc60 # v4.0.0
       with:
         timeout_minutes: 10
         max_attempts: ${{ inputs.max-retries }}